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authorDavid S. Miller <davem@davemloft.net>2017-11-14 16:17:38 +0900
committerDavid S. Miller <davem@davemloft.net>2017-11-14 16:17:38 +0900
commit166c88189632b6b13612dc15e031f58d199602da (patch)
tree2380e848d36cc85e915901acc3d428f6001e7885 /net/rxrpc
parent442866ff9743d51957685cecaa722a7fd47b02e2 (diff)
parentdcbefc30fbc2c1926bcecdd62579e3e107653d82 (diff)
Merge tag 'rxrpc-next-20171111' of git://git.kernel.org/pub/scm/linux/kernel/git/dhowells/linux-fs
David Howells says: ==================== rxrpc: Fixes Here are some patches that fix some things in AF_RXRPC: (1) Prevent notifications from being passed to a kernel service for a call that it has ended. (2) Fix a null pointer deference that occurs under some circumstances when an ACK is generated. (3) Fix a number of things to do with call expiration. ==================== Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/rxrpc')
-rw-r--r--net/rxrpc/af_rxrpc.c16
-rw-r--r--net/rxrpc/ar-internal.h1
-rw-r--r--net/rxrpc/call_event.c2
-rw-r--r--net/rxrpc/call_object.c1
-rw-r--r--net/rxrpc/input.c2
-rw-r--r--net/rxrpc/output.c19
-rw-r--r--net/rxrpc/recvmsg.c2
7 files changed, 36 insertions, 7 deletions
diff --git a/net/rxrpc/af_rxrpc.c b/net/rxrpc/af_rxrpc.c
index 344b2dcad52d..9b5c46b052fd 100644
--- a/net/rxrpc/af_rxrpc.c
+++ b/net/rxrpc/af_rxrpc.c
@@ -322,6 +322,14 @@ struct rxrpc_call *rxrpc_kernel_begin_call(struct socket *sock,
}
EXPORT_SYMBOL(rxrpc_kernel_begin_call);
+/*
+ * Dummy function used to stop the notifier talking to recvmsg().
+ */
+static void rxrpc_dummy_notify_rx(struct sock *sk, struct rxrpc_call *rxcall,
+ unsigned long call_user_ID)
+{
+}
+
/**
* rxrpc_kernel_end_call - Allow a kernel service to end a call it was using
* @sock: The socket the call is on
@@ -336,6 +344,14 @@ void rxrpc_kernel_end_call(struct socket *sock, struct rxrpc_call *call)
mutex_lock(&call->user_mutex);
rxrpc_release_call(rxrpc_sk(sock->sk), call);
+
+ /* Make sure we're not going to call back into a kernel service */
+ if (call->notify_rx) {
+ spin_lock_bh(&call->notify_lock);
+ call->notify_rx = rxrpc_dummy_notify_rx;
+ spin_unlock_bh(&call->notify_lock);
+ }
+
mutex_unlock(&call->user_mutex);
rxrpc_put_call(call, rxrpc_call_put_kernel);
}
diff --git a/net/rxrpc/ar-internal.h b/net/rxrpc/ar-internal.h
index ea5600b747cc..b2151993d384 100644
--- a/net/rxrpc/ar-internal.h
+++ b/net/rxrpc/ar-internal.h
@@ -525,6 +525,7 @@ struct rxrpc_call {
unsigned long flags;
unsigned long events;
spinlock_t lock;
+ spinlock_t notify_lock; /* Kernel notification lock */
rwlock_t state_lock; /* lock for state transition */
u32 abort_code; /* Local/remote abort code */
int error; /* Local error incurred */
diff --git a/net/rxrpc/call_event.c b/net/rxrpc/call_event.c
index 7a77844aab16..3574508baf9a 100644
--- a/net/rxrpc/call_event.c
+++ b/net/rxrpc/call_event.c
@@ -386,7 +386,7 @@ recheck_state:
now = ktime_get_real();
if (ktime_before(call->expire_at, now)) {
- rxrpc_abort_call("EXP", call, 0, RX_CALL_TIMEOUT, -ETIME);
+ rxrpc_abort_call("EXP", call, 0, RX_USER_ABORT, -ETIME);
set_bit(RXRPC_CALL_EV_ABORT, &call->events);
goto recheck_state;
}
diff --git a/net/rxrpc/call_object.c b/net/rxrpc/call_object.c
index fcdd6555a820..4c7fbc6dcce7 100644
--- a/net/rxrpc/call_object.c
+++ b/net/rxrpc/call_object.c
@@ -124,6 +124,7 @@ struct rxrpc_call *rxrpc_alloc_call(gfp_t gfp)
INIT_LIST_HEAD(&call->sock_link);
init_waitqueue_head(&call->waitq);
spin_lock_init(&call->lock);
+ spin_lock_init(&call->notify_lock);
rwlock_init(&call->state_lock);
atomic_set(&call->usage, 1);
call->debug_id = atomic_inc_return(&rxrpc_debug_id);
diff --git a/net/rxrpc/input.c b/net/rxrpc/input.c
index 1e37eb1c0c66..1b592073ec96 100644
--- a/net/rxrpc/input.c
+++ b/net/rxrpc/input.c
@@ -298,8 +298,6 @@ static bool rxrpc_end_tx_phase(struct rxrpc_call *call, bool reply_begun,
write_unlock(&call->state_lock);
if (call->state == RXRPC_CALL_CLIENT_AWAIT_REPLY) {
- rxrpc_propose_ACK(call, RXRPC_ACK_IDLE, 0, 0, false, true,
- rxrpc_propose_ack_client_tx_end);
trace_rxrpc_transmit(call, rxrpc_transmit_await_reply);
} else {
trace_rxrpc_transmit(call, rxrpc_transmit_end);
diff --git a/net/rxrpc/output.c b/net/rxrpc/output.c
index 71e6f713fbe7..f47659c7b224 100644
--- a/net/rxrpc/output.c
+++ b/net/rxrpc/output.c
@@ -35,7 +35,8 @@ struct rxrpc_abort_buffer {
/*
* Fill out an ACK packet.
*/
-static size_t rxrpc_fill_out_ack(struct rxrpc_call *call,
+static size_t rxrpc_fill_out_ack(struct rxrpc_connection *conn,
+ struct rxrpc_call *call,
struct rxrpc_ack_buffer *pkt,
rxrpc_seq_t *_hard_ack,
rxrpc_seq_t *_top,
@@ -77,8 +78,8 @@ static size_t rxrpc_fill_out_ack(struct rxrpc_call *call,
} while (before_eq(seq, top));
}
- mtu = call->conn->params.peer->if_mtu;
- mtu -= call->conn->params.peer->hdrsize;
+ mtu = conn->params.peer->if_mtu;
+ mtu -= conn->params.peer->hdrsize;
jmax = (call->nr_jumbo_bad > 3) ? 1 : rxrpc_rx_jumbo_max;
pkt->ackinfo.rxMTU = htonl(rxrpc_rx_mtu);
pkt->ackinfo.maxMTU = htonl(mtu);
@@ -148,7 +149,7 @@ int rxrpc_send_ack_packet(struct rxrpc_call *call, bool ping)
}
call->ackr_reason = 0;
}
- n = rxrpc_fill_out_ack(call, pkt, &hard_ack, &top, reason);
+ n = rxrpc_fill_out_ack(conn, call, pkt, &hard_ack, &top, reason);
spin_unlock_bh(&call->lock);
@@ -221,6 +222,16 @@ int rxrpc_send_abort_packet(struct rxrpc_call *call)
rxrpc_serial_t serial;
int ret;
+ /* Don't bother sending aborts for a client call once the server has
+ * hard-ACK'd all of its request data. After that point, we're not
+ * going to stop the operation proceeding, and whilst we might limit
+ * the reply, it's not worth it if we can send a new call on the same
+ * channel instead, thereby closing off this call.
+ */
+ if (rxrpc_is_client_call(call) &&
+ test_bit(RXRPC_CALL_TX_LAST, &call->flags))
+ return 0;
+
spin_lock_bh(&call->lock);
if (call->conn)
conn = rxrpc_get_connection_maybe(call->conn);
diff --git a/net/rxrpc/recvmsg.c b/net/rxrpc/recvmsg.c
index e4937b3f3685..8510a98b87e1 100644
--- a/net/rxrpc/recvmsg.c
+++ b/net/rxrpc/recvmsg.c
@@ -40,7 +40,9 @@ void rxrpc_notify_socket(struct rxrpc_call *call)
sk = &rx->sk;
if (rx && sk->sk_state < RXRPC_CLOSE) {
if (call->notify_rx) {
+ spin_lock_bh(&call->notify_lock);
call->notify_rx(sk, call, call->user_call_ID);
+ spin_unlock_bh(&call->notify_lock);
} else {
write_lock_bh(&rx->recvmsg_lock);
if (list_empty(&call->recvmsg_link)) {